RT9170
300mA CMOS LDO Regulator with 15μA Quiescent Current
μ
General Description
The RT9170 is CMOS ultra low quiescent current and low
dropout (ULDO) regulators. The devices are capable of
supplying 300mA of output current continuously.
The RT9170's performance is optimized for battery-
powered systems to deliver 15uA ultra low quiescent
current and extremely low dropout voltage. Regulator
ground current increases only slightly in dropout, further
prolonging the battery life. The other features include ultra
low dropout voltage, high output accuracy, current limiting
protection, and high ripple rejection ratio.
The devices are available in fixed output voltages range of
1.2V to 3.3V with 0.1V per step. The RT9170 regulators
are available in
SOT-23-3, SOT-23-5
and 3-lead SOT-89
packages.
Features
Ultra-Low Quiescent Current (Typically 15uA)
Guaranteed 300mA Output Current
Low Dropout : 240mV at 300mA
Wide Operating Voltage Ranges : 2V to 5.5V
Fast Transient Response
Tight Load and Line Regulation
TTL-Logic-Controlled Enable Input
Current Limiting & Thermal Protection
Only 1uF Output Capacitor Required for Stability
High Power Supply Rejection Ratio
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Phones and Pagers
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Ordering Information
RT9170-
Package Type
V: SOT-23-3
B: SOT-23-5
X : SOT-89
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
12 : 1.2V
13 : 1.3V
:
32 : 3.2V
33 : 3.3V
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
VIN
3
EN
5
NC
4
2
2
3
GND
VOUT
GND VIN VOUT
SOT-23-3
SOT-23-5
1
2
3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
GND
VIN VOUT
(TAB)
SOT-89
DS9170-14 April 2011
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1
RT9170
Typical Application Circuit
V
IN
C
IN
1uF
Chip Enable
VIN
RT9170-
EN
GND
VOUT
xB
V
OUT
C
OUT
1uF
Functional Pin Description
Pin No.
SOT-23-3
3
2
1
-
-
SOT-23-5
2
3
1
5
4
SOT-89
2
3
1
-
-
Pin Name
VIN
VOU T
GND
EN
NC
Pin Function
Power Input Voltage.
Output Voltage.
Ground.
Chip Enable (Active Low).
No Internal Connection.
Function Block Diagram
VIN
Current Limit
&
Thermal Shutdown
VOUT
+
-
EN
GND
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DS9170-14 April 2011
RT9170
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 7V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-3 ---------------------------------------------------------------------------------------------------------------
0.4W
SOT-23-5 ---------------------------------------------------------------------------------------------------------------
0.4W
SOT-89 ----------------------------------------------------------------------------------------------------------------- 0.571W
Package Thermal Resistance (Note 2)
SOT-23-3,
θ
JA
--------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5,
θ
JA
--------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89,
θ
JA
----------------------------------------------------------------------------------------------------------- 175°C/W
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range ---------------------------------------------------------------------------------------
−
65° C to 150° C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 2V to 5.5V
Enable Input Voltage ------------------------------------------------------------------------------------------------ 0V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------
−
40°C to 125°C
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 1uF, T
A
= 25° C, unless otherwise specified)
Parameter
Output Voltage Accuracy
Current Limit
Quiescent Current
Dropout Voltage
Line Regulation
Load Regulation
Standby Current
EN Threshold
(Note 6)
(Note 7)
Logic-Low Voltage
Logic-High Voltage
Power Supply Rejection
Thermal Shutdown Temperature
(Note 5)
Symbol
ΔV
OUT
I
LIM
I
Q
V
DROP
ΔV
LINE
ΔV
LOAD
I
STB Y
V
IL
V
IH
PSRR
T
SD
Test Conditions
I
OUT
= 1mA
R
LOAD
= 1Ω
V
EN
≤
0.6V, I
OUT
= 0mA
I
OUT
= 300mA
V
IN
= (V
OUT
+ 0.3V) to 5.5V,
I
OUT
= 1mA
1mA
<
I
OUT
<
300mA
V
EN
≥
2V (Shutdown), V
IN
= 5.5V
V
IN
= 2V to 5.5V, Enable
V
IN
= 2V to 5.5V, Shutdown
f = 1kHz, C
OUT
= 1μF
Min
−2
300
--
--
−0.3
--
--
--
2
--
--
Typ
--
--
15
240
0.018
0.01
0.1
--
--
−40
150
Max
+2
--
--
--
+0.3
0.04
--
0.6
--
--
--
Unit
%
mA
μA
mV
%/V
%/mA
μA
V
dB
°C
DS9170-14 April 2011
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RT9170
Note 1.
Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions
Note 5.
Quiescent, or ground current, is the difference between input and output currents. It is defined by I
Q
= I
IN
- I
OUT
under no
load condition (I
OUT
= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
current.
Note 6.
Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load
regulation in the load range from 1mA to 300mA.
Note 7.
Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal
(V
EN
≥
2V). It is measured with V
IN
= 5.5V.
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DS9170-14 April 2011
RT9170
Typical Operating Characteristics
Temperature Stability
2.55
2.53
Quiescent Current vs. Load Current
18
17
No Load
Output Voltage (V)1
2.51
2.49
Quiescent Current (uA)
1
105
125
16
15
14
13
12
11
10
I
LOAD
= 250mA
2.47
2.45
2.43
2.41
2.39
2.37
2.35
-35
-15
5
25
45
65
85
V
IN
= 3.5V
V
OUT
= 2.5V
C
IN
= 1uF (Ceramic)
C
OUT
= 1uF (Ceramic)
V
IN
= 3.5V
V
OUT
= 2.5V
C
IN
= 1uF (Ceramic)
C
OUT
= 1uF (Ceramic)
0
0.05
0.1
0.15
0.2
0.25
0.3
Temperature
(
°
C)
Load Current (A)
Quiescent Current vs. Temperature
18
16
18
Quiescent Current vs. Supply Voltage
16
I
LOAD
= 200mA
Quiescent Current (uA)
1
Quiescent Current (uA)
1
14
12
10
8
6
4
2
0
-35
-15
5
25
45
65
85
105
125
14
12
10
8
6
4
2
0
2
2.5
3
3.5
4
4.5
5
5.5
No Load
No Load
I
LOAD
= 200mA
V
IN
= 3.5V
V
OUT
= 2.5V
C
IN
= 1uF (Ceramic)
C
OUT
= 1uF (Ceramic)
V
OUT
= 2.5V
C
IN
= 1uF (Ceramic)
C
OUT
= 1uF (Ceramic)
Temperature
(
°
C)
Supply Voltage (V)
Dropout Voltage vs. Load Current
300
250
Output Voltage vs. Supply Voltage
2.55
V
OUT
= 3.3V
2.53
Dropout Voltage (mV)
200
Output Voltage (V)1
T
J
= 125°C
T
J
= 25°C
150
100
2.51
2.49
T
J
= -40°C
50
0
0
0.05
0.1
0.15
0.2
0.25
0.3
2.47
V
OUT
= 2.5V
C
IN
= 1uF (Ceramic)
C
OUT
= 1uF (Ceramic)
I
LOAD
= 1mA
2.5
3
3.5
4
4.5
5
5.5
2.45
Load Current (A)
Supply Voltage (V)
DS9170-14 April 2011
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